US20070138617A1 - Using a thru-hole via to improve circuit density in a pcb - Google Patents
Using a thru-hole via to improve circuit density in a pcb Download PDFInfo
- Publication number
- US20070138617A1 US20070138617A1 US11/563,729 US56372906A US2007138617A1 US 20070138617 A1 US20070138617 A1 US 20070138617A1 US 56372906 A US56372906 A US 56372906A US 2007138617 A1 US2007138617 A1 US 2007138617A1
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- United States
- Prior art keywords
- electrically conductive
- circuit board
- printed circuit
- thru
- conductive traces
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/115—Via connections; Lands around holes or via connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49827—Via connections through the substrates, e.g. pins going through the substrate, coaxial cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49838—Geometry or layout
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
- H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
- H05K1/114—Pad being close to via, but not surrounding the via
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09645—Patterning on via walls; Plural lands around one hole
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
Definitions
- a printed circuit board that includes multiple layers on which electrically conductive traces reside, where at least two of the electrically conductive traces each has a first portion formed on one layer of the printed circuit board and a second portion formed on another layer of the printed circuit board.
- the printed circuit board also includes a thru-hole via that includes at least two electrically conductive portions electrically isolated from each other, such that each of the electrically conductive portions connects electrically to both the first and second portions of a corresponding one of the electrically conductive traces.
- the electrically conductive traces run in directions that are parallel to each other, and in other cases, the electrically conductive traces run in directions that intersect (e.g., are perpendicular to) each other.
- the electrically conductive traces run in directions that intersect each other, the first and second portions of at least one of the electrically conductive traces are often co-linear with each other, while the first and second portions of another of the electrically conductive traces are not co-linear with each other.
- the electrically conductive traces are positioned to reside in separate circuits in the printed circuit board.
- the printed circuit board often has multiple layers, and the first and second portions of each of the electrically conductive traces often lie on separate layers.
- a printed circuit board that includes at least two mounting pads formed on a surface for mounting a circuit component, such as array of pads formed for mounting a ball grid array (BGA) package.
- the printed circuit board also includes a thru-hole via that includes at least two electrically conductive portions that are electrically isolated from each other, where each of the electrically conductive portions of the thru-hole via connects electrically to at least one of the mounting pads in the array.
- each of the electrically conductive portions of the thru-hole via connects at least one of the mounting pads to a layer of the printed circuit board other than the layer on which the mounting pads are formed. Also, the thru-hole via is often positioned physically between two of the mounting pads.
- FIG. 1 is diagram showing a printed circuit board (PCB) with a thru-hole via through which multiple electrically conductive traces pass.
- PCB printed circuit board
- FIG. 2 is a diagram showing a thru-hole via through which currents from separate circuits pass.
- FIG. 3 is a diagram showing a thru-hole via through which currents from separate circuits pass on conductive traces that run in intersecting directions.
- FIG. 4 is a diagram showing a traditional conductive mounting-pad footprint for a ball grid array (BGA) package.
- BGA ball grid array
- FIG. 5 is a diagram showing an alternative conductive mounting-pad footprint for a BGA package.
- FIG. 1 shows a multi-layer printed circuit board (PCB) 100 having a thru-hole via 110 that is constructed to allow multiple conductive traces to pass from one layer of the PCB to another layer of the PCB.
- a thru-hole via or plated through hole is a hole formed through the layers of a printed circuit board and then coated (or “plated”) with an electrically conductive material (typically a metal such as copper) to allow an electrical signal in the PCB to move from one layer to another and/or to allow a conductive pin on an electronic component to connect to a reference plane or a signal trace in the PCB.
- the conductive coating covers the entire surface of the via, thus allowing only a single conductive trace to pass through the via or a single electronic component to connect to the via.
- the thru-hole via 110 of FIG. 1 is constructed so that its internal surface 120 includes multiple conductive portions 130 , 140 that are separated physically by gaps. This ensures that the conductive portions 130 , 140 are electrically isolated—i.e, that no electrically conductive path exists between the conductive portions 130 , 140 when the PCB is fabricated and has not yet been populated with electronic components.
- a process for fabricating such a thru-hole via 110 in a PCB is described in detail in the U.S. application incorporated by reference above.
- FIG. 2 shows a thru-hole via 200 through which conductive traces 210 , 220 from two separate circuits pass in transitioning from one layer of a multi-layer PCB to another layer.
- the conductive traces 210 , 220 in residing in two separate circuits, are electrically isolated from each other when the PCB is fabricated and before it is populated with electronic components.
- the thru-hole via 200 has a construction like that shown in FIG. 1 , with two electrically isolated, electrically conductive portions 230 , 240 formed on its inner surface.
- each of the conductive traces 210 , 220 has a first conductive portion 210 A, 220 A (shown in solid lines) lying on a first layer of the PCB and a second conductive portion 210 B, 220 B (shown in dashed lines) lying on a second layer of the PCB.
- each conductive trace 210 , 220 that carries current on the first layer of the PCB intersects the thru-hole via 200 and makes electrical contact with a corresponding one of the electrically conductive portions 230 , 240 of the thru-hole via 200 .
- the current flowing through the conductive traces 210 , 220 then passes through the electrically conductive portions 230 , 240 of the thru-hole via 200 to the portions 210 B, 220 B of the electrically conductive traces 210 , 220 that lie on the second layer of the PCB.
- FIG. 3 shows another thru-hole via 300 through which conductive traces 310 , 320 from two separate circuits pass in transitioning from one layer of a multi-layer PCB to another layer.
- the conductive traces 310 , 320 run in directions that intersect each other and which, in fact, are perpendicular to each other in this example.
- each of the conductive traces 310 , 320 shown here has a first conductive portion 310 A, 320 A (shown in solid lines) lying on a first layer of the PCB and a second conductive portion 310 B, 320 B (shown in dashed lines) lying on a second layer of the PCB.
- the portion 310 A, 320 A of each conductive trace 310 , 320 that carries current on the first layer of the PCB intersects the thru-hole via 300 and makes electrical contact with a corresponding electrically conductive portion 330 , 340 of the thru-hole via 300 .
- the currents flowing through the conductive traces 310 , 320 then pass through the electrically conductive portions 330 , 340 of the thru-hole via 300 to the portions 310 B, 320 B of the electrically conductive traces 310 , 320 that lie on the second layer of the PCB.
- one of the conductive portions 310 B of at least one of the conductive traces 310 , on intersecting the corresponding electrically conductive portion 330 of the thru-hole via 300 is routed especially to avoid intersecting the electrically conductive portion 340 of the thru-hole via 300 that carries current from the other conductive trace 320 .
- the result, as shown, here, is that the conductive portions 320 A, 320 B of one of the conductive traces 320 are co-linear, while the conductive portions 310 A, 310 B of the other conductive trace 310 are not.
- FIGS. 4 and 5 together show another use for a thru-hole via that is constructed to improve circuit density on a PCB.
- FIG. 4 shows a mounting-pad configuration 400 for a ball grid array (BGA) package using traditional PCB fabrication techniques.
- BGA ball grid array
- the two mounting pads 410 , 420 lying at the center of the array must connect to one or more inner layers of the PCB.
- two thru-hole vias 430 , 440 are drilled in the PCB and plated with an electrically conductive material, such as copper. The result is that the pins of the BGA that contact the two mounting pads 410 , 420 at the center of the array are connected electrically to the inner layers of the PCB by the thru-hole vias 430 , 440 .
- FIG. 5 shows a mounting-pad configuration 500 for a BGA package that reduces the amount of PCB real estate consumed by the BGA package and thus allows for the inclusion of additional circuit components that are not possible using traditional PCB fabrication techniques.
- the two mounting pads 510 , 520 lying at the center of the array connect electrically to a single thru-hole via 530 .
- the thru-hole via 510 shown here includes two electrically isolated, electrically conductive portions 540 , 550 that extend through the thru-hole via 530 .
- Each of these electrically conductive portions 540 , 550 of the thru-hole via 530 connects electrically to one of the mounting pads 510 , 520 at the center of the array and, in turn, connects the mounting pad to one or more of the inner layers of the PCB.
Abstract
Description
- This application claims priority from U.S. Provisional Application 60/752,448, filed on Dec. 21, 2005, by James L. Knighten, Jun Fan, and Norman W. Smith. This application is related to, and incorporates by reference, U.S. application Ser. No. ______, titled “Passing Multiple Conductive Traces Through a Thru-Hole Via in a PCB,” and filed on by Jun Fan, Arthur R. Alexander, James L. Knighten, Norman W. Smith, and Joseph R. Fleming (NCR matter 12226); and to U.S. application Ser. No. ______, titled “Crossing Conductive Traces in a PCB,” and filed on ______, by James L. Knighten, Norman W. Smith and Jun Fan (NCR matter 12366).
- One of the largest challenges that the electronics industry persistently faces is the ability to achieve the ever-higher levels of packaging density required to meet the ever-increasing demands for feature-rich design and very small packaging. In this environment, any design approach that increases packaging density is a valuable tool in the design arsenal.
- Described below is a printed circuit board that includes multiple layers on which electrically conductive traces reside, where at least two of the electrically conductive traces each has a first portion formed on one layer of the printed circuit board and a second portion formed on another layer of the printed circuit board. The printed circuit board also includes a thru-hole via that includes at least two electrically conductive portions electrically isolated from each other, such that each of the electrically conductive portions connects electrically to both the first and second portions of a corresponding one of the electrically conductive traces.
- In some cases, the electrically conductive traces run in directions that are parallel to each other, and in other cases, the electrically conductive traces run in directions that intersect (e.g., are perpendicular to) each other. When the electrically conductive traces run in directions that intersect each other, the first and second portions of at least one of the electrically conductive traces are often co-linear with each other, while the first and second portions of another of the electrically conductive traces are not co-linear with each other.
- In some cases, the electrically conductive traces are positioned to reside in separate circuits in the printed circuit board. Also, the printed circuit board often has multiple layers, and the first and second portions of each of the electrically conductive traces often lie on separate layers.
- Also described is a printed circuit board that includes at least two mounting pads formed on a surface for mounting a circuit component, such as array of pads formed for mounting a ball grid array (BGA) package. The printed circuit board also includes a thru-hole via that includes at least two electrically conductive portions that are electrically isolated from each other, where each of the electrically conductive portions of the thru-hole via connects electrically to at least one of the mounting pads in the array.
- In some cases, each of the electrically conductive portions of the thru-hole via connects at least one of the mounting pads to a layer of the printed circuit board other than the layer on which the mounting pads are formed. Also, the thru-hole via is often positioned physically between two of the mounting pads.
- Other features and advantages will become apparent from the description and claims that follow.
-
FIG. 1 is diagram showing a printed circuit board (PCB) with a thru-hole via through which multiple electrically conductive traces pass. -
FIG. 2 is a diagram showing a thru-hole via through which currents from separate circuits pass. -
FIG. 3 is a diagram showing a thru-hole via through which currents from separate circuits pass on conductive traces that run in intersecting directions. -
FIG. 4 is a diagram showing a traditional conductive mounting-pad footprint for a ball grid array (BGA) package. -
FIG. 5 is a diagram showing an alternative conductive mounting-pad footprint for a BGA package. -
FIG. 1 shows a multi-layer printed circuit board (PCB) 100 having a thru-hole via 110 that is constructed to allow multiple conductive traces to pass from one layer of the PCB to another layer of the PCB. A thru-hole via or plated through hole, as the term is commonly understood in the art of PCB manufacturing, is a hole formed through the layers of a printed circuit board and then coated (or “plated”) with an electrically conductive material (typically a metal such as copper) to allow an electrical signal in the PCB to move from one layer to another and/or to allow a conductive pin on an electronic component to connect to a reference plane or a signal trace in the PCB. In a traditional thru-hole via, the conductive coating covers the entire surface of the via, thus allowing only a single conductive trace to pass through the via or a single electronic component to connect to the via. - The thru-hole via 110 of
FIG. 1 is constructed so that itsinternal surface 120 includes multipleconductive portions conductive portions conductive portions -
FIG. 2 shows a thru-hole via 200 through whichconductive traces conductive traces - The thru-hole via 200 has a construction like that shown in
FIG. 1 , with two electrically isolated, electricallyconductive portions conductive traces conductive portion conductive portion - The
portion conductive trace conductive portions conductive traces conductive portions portions conductive traces - The result of this construction is an improvement in PCB circuit density. Because a single thru-hole via is used to pass currents from multiple separate circuits, fewer via pads and anti-pads are needed on the PCB than are required by traditional PCB fabrication techniques, thus conserving PCB real estate and allowing the placement of a greater number of circuit components on the PCB.
-
FIG. 3 shows another thru-hole via 300 through whichconductive traces conductive traces - As with the conductive traces of
FIG. 2 , each of theconductive traces conductive portion conductive portion portion conductive trace conductive portion conductive traces conductive portions portions conductive traces - In the example of
FIG. 3 , because theconductive traces conductive portions 310B of at least one of theconductive traces 310, on intersecting the corresponding electricallyconductive portion 330 of the thru-hole via 300, is routed especially to avoid intersecting the electricallyconductive portion 340 of the thru-hole via 300 that carries current from the otherconductive trace 320. The result, as shown, here, is that theconductive portions conductive traces 320 are co-linear, while theconductive portions conductive trace 310 are not. -
FIGS. 4 and 5 together show another use for a thru-hole via that is constructed to improve circuit density on a PCB.FIG. 4 shows a mounting-pad configuration 400 for a ball grid array (BGA) package using traditional PCB fabrication techniques. In thisconfiguration 400, the twomounting pads hole vias mounting pads hole vias -
FIG. 5 shows a mounting-pad configuration 500 for a BGA package that reduces the amount of PCB real estate consumed by the BGA package and thus allows for the inclusion of additional circuit components that are not possible using traditional PCB fabrication techniques. In this example, the twomounting pads conductive portions conductive portions mounting pads - The text above describes one or more specific embodiments of a broader invention. The invention also is carried out in a variety of alternative embodiments and thus is not limited to those described here. Many other embodiments are also within the scope of the following claims.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/563,729 US7456364B2 (en) | 2005-12-21 | 2006-11-28 | Using a thru-hole via to improve circuit density in a PCB |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75244805P | 2005-12-21 | 2005-12-21 | |
US11/563,729 US7456364B2 (en) | 2005-12-21 | 2006-11-28 | Using a thru-hole via to improve circuit density in a PCB |
Publications (2)
Publication Number | Publication Date |
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US20070138617A1 true US20070138617A1 (en) | 2007-06-21 |
US7456364B2 US7456364B2 (en) | 2008-11-25 |
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US11/563,729 Expired - Fee Related US7456364B2 (en) | 2005-12-21 | 2006-11-28 | Using a thru-hole via to improve circuit density in a PCB |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100314742A1 (en) * | 2009-06-15 | 2010-12-16 | Sung Min Kim | Semiconductor package |
US20130092429A1 (en) * | 2009-02-26 | 2013-04-18 | Jason John Ellison | Cross talk reduction for high-speed electrical connectors |
US8764464B2 (en) | 2008-02-29 | 2014-07-01 | Fci Americas Technology Llc | Cross talk reduction for high speed electrical connectors |
US20190207341A1 (en) * | 2017-12-28 | 2019-07-04 | Tyco Electronics (Shanghai) Co. Ltd. | Connector |
US20190207327A1 (en) * | 2017-12-28 | 2019-07-04 | Tyco Electronics (Shanghai) Co. Ltd. | Circuit Board and Card |
WO2023287569A1 (en) * | 2021-07-13 | 2023-01-19 | Corning Incorporated | Vias including a plurality of traces, devices including the vias, and methods for fabricating the vias |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080025007A1 (en) * | 2006-07-27 | 2008-01-31 | Liquid Computing Corporation | Partially plated through-holes and achieving high connectivity in multilayer circuit boards using the same |
US8791550B1 (en) | 2013-01-15 | 2014-07-29 | International Business Machines Corporation | Hybrid conductor through-silicon-via for power distribution and signal transmission |
Citations (4)
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US6388208B1 (en) * | 1999-06-11 | 2002-05-14 | Teradyne, Inc. | Multi-connection via with electrically isolated segments |
US6555761B2 (en) * | 2000-12-29 | 2003-04-29 | Intel Corporation | Printed circuit board with solder-filled via |
US6747217B1 (en) * | 2001-11-20 | 2004-06-08 | Unisys Corporation | Alternative to through-hole-plating in a printed circuit board |
US20050224912A1 (en) * | 2004-03-17 | 2005-10-13 | Rogers Shawn D | Circuit and method for enhanced low frequency switching noise suppression in multilayer printed circuit boards using a chip capacitor lattice |
-
2006
- 2006-11-28 US US11/563,729 patent/US7456364B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6388208B1 (en) * | 1999-06-11 | 2002-05-14 | Teradyne, Inc. | Multi-connection via with electrically isolated segments |
US6555761B2 (en) * | 2000-12-29 | 2003-04-29 | Intel Corporation | Printed circuit board with solder-filled via |
US6747217B1 (en) * | 2001-11-20 | 2004-06-08 | Unisys Corporation | Alternative to through-hole-plating in a printed circuit board |
US20050224912A1 (en) * | 2004-03-17 | 2005-10-13 | Rogers Shawn D | Circuit and method for enhanced low frequency switching noise suppression in multilayer printed circuit boards using a chip capacitor lattice |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8764464B2 (en) | 2008-02-29 | 2014-07-01 | Fci Americas Technology Llc | Cross talk reduction for high speed electrical connectors |
US20130092429A1 (en) * | 2009-02-26 | 2013-04-18 | Jason John Ellison | Cross talk reduction for high-speed electrical connectors |
US9277649B2 (en) * | 2009-02-26 | 2016-03-01 | Fci Americas Technology Llc | Cross talk reduction for high-speed electrical connectors |
US20100314742A1 (en) * | 2009-06-15 | 2010-12-16 | Sung Min Kim | Semiconductor package |
US7968918B2 (en) * | 2009-06-15 | 2011-06-28 | Hynix Semiconductor Inc. | Semiconductor package |
EP2766955A4 (en) * | 2011-10-14 | 2015-07-08 | Fci Asia Pte Ltd | Cross talk reduction for high-speed electrical connectors |
US20190207341A1 (en) * | 2017-12-28 | 2019-07-04 | Tyco Electronics (Shanghai) Co. Ltd. | Connector |
US20190207327A1 (en) * | 2017-12-28 | 2019-07-04 | Tyco Electronics (Shanghai) Co. Ltd. | Circuit Board and Card |
US10630002B2 (en) * | 2017-12-28 | 2020-04-21 | Tyco Electronics (Shanghai) Co. Ltd. | Circuit board and card |
US10868386B2 (en) * | 2017-12-28 | 2020-12-15 | Tyco Electronics (Shanghai) Co. Ltd. | Connector |
WO2023287569A1 (en) * | 2021-07-13 | 2023-01-19 | Corning Incorporated | Vias including a plurality of traces, devices including the vias, and methods for fabricating the vias |
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US7456364B2 (en) | 2008-11-25 |
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